Cooling system to reduce liquid metal embrittlement in metal tube and pipe

Abstract

A system and method for cooling a heat exchanger.

1 . A braze furnace cooling system for brazing heat exchangers, the heat exchangers having a plurality of fins and a plurality of return bends, the system comprising:
 a brazing heat source;   a conveyor configured to move heat exchangers in a direction of travel such that the return bends are proximate to the brazing heat source for a period of time;   one or more fluid nozzles configured to direct a sheet of pressurized fluid along the plurality of fins.   
     
     
         2 . The system of  claim 1 , wherein the fluid nozzles are configured to provide a laminar flow of fluid. 
     
     
         3 . The system of  claim 1 , wherein the one or more fluid nozzles are oriented perpendicular to the fins of the heat exchanger, such that the sheet of pressurized fluid is directed to more than two fins of the plurality of fins. 
     
     
         4 . The system of  claim 3 , wherein the sheet of pressurized fluid is directed to more than five fins. 
     
     
         5 . The system of  claim 1 , wherein the sheet of pressurized air is substantially parallel to the plurality of fins. 
     
     
         6 . The system of  claim 1 , wherein the one or more fluid nozzles are positioned adjacent to the brazing heat source. 
     
     
         7 . The system of  claim 1 , wherein the one or more fluid nozzles are positioned at a location past the brazing heat source, with respect to the direction of travel of the conveyor. 
     
     
         8 . The system of  claim 1 , wherein the one or more fluid nozzles are positioned at a distance from the conveyor which is less than the distance between the brazing heat source and the conveyor. 
     
     
         9 . The system of  claim 1 , wherein the one or more fluid nozzles direct a flow of fluid sufficient to pass through the heat exchanger. 
     
     
         10 . The system of  claim 1 , wherein the one or more fluid nozzles are two fluid nozzles. 
     
     
         11 . A method of cooling a heat changer, comprising:
 moving an unbrazed heat exchanger through a brazing furnace;   brazing a joint of the heat exchanger in the brazing furnace;   moving the brazed heat exchanger past one or more fluid nozzles; and   directing a sheet of pressurized fluid along the plurality of fins using the one or more fluid nozzles.